[R.Takahashi, Washimi] work on June 4th @ Mitaka

We measured the TF(V) of the test stack after ~20 hours of continuous loading weight (+155 kg), without any other changes.
Measurements just after removing the weight were also performed.

In the results, the TF with additional weight was shifted to a higher frequency.
The TF without additional weight was not changed so much.

The structure at high frequency should be due to the deformation of the rubbers of the jig.